Sun Microsystems Portal Server 6 - Manual (Page 96)

Working with Portal Server Building Modules
96 Portal Server 6 2005Q1 • Deployment Planning Guide
Transparent Failover
Transparent failover uses the same replication model as the NSPOF scenario but
provides additional high availability features, which make the failover to a backup
server transparent to end users.
Figure 5-5 on page 96 shows a transparent failover scenario. Two building modules
are shown, consisting of four CPUs by eight GB RAM. Load balancing is
responsible for detecting Portal Server failures and redirecting users’ requests to a
backup Portal Server in the building module. Building Module 1 stores sessions in
the sessions repository. If a crash occurs, the application server retrieves sessions
created by Building Module 1 from the sessions repository.
Figure 5-5 Transparent Failover Example Scenario
Load
Balancer
Browser
Portal
Server
Directory
Server
Master
Replica
Multi-Master
Replication
Instance
Building Module 2
Sessions
Repository
SSe
Se s
Search
Engine
Database
Portal
Server
Directory
Server
Master
Replica
Instance
Building Module 1
SSe
Se
s
Search
Engine
Database